Cutting tool



Patented Dec. 4, 1923.

HENRY K. PORTER, F BRQOKLINE, MA ssAoHUsET rs.

CUTTING Toot.

Application file d n'tiiit'i 28; 11 321. s rii N6. 5525342.,

To all whom it ma ao'tcem; V v

Be it lznoiyn that L HEQ Y K. Poii' i nii, a itiZen of the UnitedStates, and a resident of Brookliiie, county of Norfolk, and State ofhfiass rchusetts, have invente'cl an' Improve/innit; in Cutting" Tools,of which the following (description, in connection with the accompanying,clrawings; is a I specification, like characters" on the drawingsrepresenting like parts} This invention relttes to cutters and in morespecific aspect toe hendItool of the genera type ofnippers adapted toout heavy Wire, rivets or the like. V

Theinvention will best he understood by retereiice to the followingclescriptioii of an liltlStltltiVG embodiment thereof shown way oiexample in the accompttnying drawinfzs, wherein: Y I 1 i g. 1 is apartly broken elevation of a pair cutters; a r

2 end 3 are similar view'vs of the cuttiii jaws in successive positionsdiiriiig oper 011;, I

Figs, i and 5 are sections on aneiilitrged scale on thelines H and 55 ofFig.1, respectively; :mcl, it v i P v Fig.1.- 6 is a section on the line66.of l 1. i v 7 Referring tothe-exainple of my inven tioh shown in theclraihgs,v I there show 5: tool embodying a pair of cutting le'yers orjaw members Th'aying tlie working faces 9, which in the example shownare 'ed geshaped cutting): edges, adapted to ineet as 1'. The twolevers7 are piv for con'jointractioii and in the shown in otetl' togetherJBSGlll? instance are connected by straps 11 on opposite sides of thesaline secured by pivot pins 13. The levers {may also be ne t-ted b ythe sector gearing 15 oil thei opposed faces. y Y I in important featureof my invention is the provision of means for gagiiigthe ehtrence ofwork between the cu'ttingedges oi the tool and preventing suchyvork fromcoming into contact with the joint between the two levers which mightceuse' clitiieulties. In the present instance, ifwork Were insertedvetween. the 1 edges '9, 9 into the throat between the jaws of the toolit might enter between theigeoirs 15 and jet-m the tool or damage it.This isv particularly the case U1 :1 tool suchesshownwhere n thewedgeshape of the Liiitler faces of the work ingeclges tends it drew down-theportion of the Work which is snipped off towards the jointh'e'tw'een thelevers. In accordance with m iiive'ntioii I provide a stop Which willentenc'l the manner of a bridge z'tcross the throat of. the tool atapoint between the outting edges 9 and the joint between the letters 7,1 represented in this insta ic'e by; the plane containing the centers"or the piyot points 13. This stop my conveniently take'the form oftflat plate or lest spring17 (see Fig/l) which. has bifurcated endportions embracing the twol'e'versjherein the jaws thereof, and tioeiitrally connecting portion 19 between the two side portions at eitherside of thelevers; which connecting portion is presented in theptith'o't the ork in the throtit of the tool. Thefeiids' of thespringsare conveniently stipported on the end portions of the'coimecting strips 11 which vare preferably elevated its shown in 1Otherwise stated, the central portions ofthe straps are cut awayweerinit the central portion of the spring to yield cloii nw ardly. I r

The action of the parts will best be 'uiicle'rstootl by referehc'eto'Fi'g's. 2 and 3. In Fig. 2 a rod w is shown entered between theeQlgesQ of. the ci itter Withthe eiicl in contact With the spring 417.It will be seen that the end of the rod is stopped at a dis tence' fromthe joint at 15' end that there is therefore no danger or" jamming anyof the parts; The tool is tlien operated to closethe j We and the partsthen essu ne the'positioh shown in 3." The action of the jevi spressesthe snipped. off portion of the work 10 inwardlyfztn'd' in so VsprinQ'flT; this being; permitted by the feet that the letter is siip'ported etits ends only by the elevated ends of the connectingstraps 11.When the jaws ere a'gain released the spring aids in ejecting the'siiip'ped bit piece.

The cutting levers 7 tie operated by means of suitable oper a'tiijiglevers 21 piy.- ote'd together at23 and. secured to the crit-. tinglevers at pivot points 25 preferably by connecting sections 27 whichmaybe iitilized as; hereinafter moi-efully tiescribecl for effectingcertainadjustments; It Will he i111} clerstood that the threep'oi 1ts23,25; 25 define a toggle by means of which the levers 7 are ptwerfiiilyoperated by the levers 21'; The form of connecting section 27 hereinshown eni'bodies va'rious improvements; Inv

doingbends the I the section extending over the; edge of the operatinglever 21 in the manner clearly shown in Fig. 5." connecting sectionwhether made of. two separate" parts as in the example illustrated or inone piece is of a general U-shaped form havinga back and two sideportions which overlie the sides of the levers 21 and 7 and serve aslinks to connect the same.

The back of, the connecting section, formed herein by the enlargements33, presents to the edge of the lever 21 an abutment surface or stopmeans for limiting the swinging movement of the connecting section onthelever in one direction and this abutment surface is preferably made adjustablei and for this purpose the enlargements 33 are tapped to providea nut for an adjusting screw 35 which finds a bearing on the edge of thelever 21. Referring to Fig. 1, itwill be seen that by movement. of thisscrew the section 27 may be swung clockwise. This action tendsto throwthe cutting edges 9 together and by this adjustment wear of the edgesmay be compensated for.

My invention also provides suitable means for limiting movement of theconnecting section in the opposite direction and for this purpose Iutilize suitable cooperating abutments on the section and on the lever21. 1n the example of the invention shown a portion of the lever 21 maybe made of an .1 section, a construction not'only advantageous .initself on account of the stiffness and the strength given to the leverbut providing an edge flange 37 which may be utilized as an abutment ina manner hereinafter described. Suitable abutments are formed on thesides of the section 27 to cooperate with abutments on the lever 21 suchas the edge flange referred to and preferably they are formed asprojections 39, best shown in dotted lines in Fig. 1, on the inner facesof the sideportions of this section and adapted to be inserted betweenthe flanges of the lever 21 to play between the same and to cooperatewith the edge-flange 3'? in limiting swinging movement of the connectingsection 27 in a clockwise direction viewing Fig. 1. Particularly whenthe connecting section is made in two pieces 29 as herein disclosed,such pieces with the inner projections 39" are very readily and cheaplyThe preferred form of:

formed by casting and the pieces may be applied from the side to seatthe projections 39 between the flanges of the lever 21 after t whichthey are secured in position by means of the pivot pins 25 and 31.

Ordinarily the nut formed by the enlargements 33 and which is adapted tore-,

ceive the adjusting screw 35 is tapped after the parts are assembled andwhen its separate pieces are thus held in proper position by means ofthe pivots 25 'and 31. One or both of the links .29 are thereforepreferably provided with transverse openings 41 which intersect the boreof the nut or communicate therewith closely adjacent the base thereofand provide for discharge: of the borings during the tapping operationas the interior of the U-shaped section formed by the clamped togetherparts29 is substan-I 7 and 21 received roughnesses whichwill cut intothe hands and either render a grip prohibitively uncomfortable or serveas a warning signal that the tool is improperly grasped. Here in theseasperities are provided by the sharp corner-s of a square section of thehandle. Such square portions also provide enlargements which tend'toprevent the handfrom slipping up on the handle in such a way as to comeinto contact with the metal parts of the tool. i V r I have described indetail the particular form of my invention shown byway of eX ample inthe accompanying drawings. It

will be understood, however, that various features of construction,while shown in connection with a bifurcated nipping tool as shown, maybe applied to other devices of the same general character andfurthermore that they may be applied to tools haw ing different types ofworking faces on the jaws 9 and levers pivoted together in other mannerthan as herein illustrated. The principles exemplified by the particularexample shown which I claim as new and desire to secureby Letters PatentI shall express in the following claims.

Claims:

1. A tool comprising cooperating rela tively swinging jaws and a fiatspring having bifurcated ends embracing the jaws between their pivotpoints and working faces and having a central portion interposedbe;tween work entered into said jaws and the joints between them. i

A tool comprising relatively swinging jaws, links arranged upon oppositesides of said jaws at their throats to permit conjoint movementof saidjaws and an automati ally adjustable yielding stop s'upported'by both ofsaid links at points adjacent to the pivots of said jaws, said stophaving means transversely bridgingsaid throat. v

3. A tool comprising relatively swinging jaws having their .pivotpointsconnectedby straps arranged at opposed faces of said jaws, portions ofwhich support the ends of a leaf spring device provided with a portiontransversely bridging the throat abovethe jaws between said straps at adistance from the plane of the pivotal centers of said 'aws,

4. A tool comprising relatively swinging jaws having their pivot pointsconnected by straps provided with raised end portionsand a spring havingbifurcated, ends embracing the jaws and resting on said end portions.

5. A tool comprising relatively swinging jaws and a stop plateextendingtransversely of the throat of the tool having slots in which the jawswork. i

6. A tool of the class described having swinging jaws connected at theirthroat by a pair of links for conjoint movement, and an automaticallyadjustable yielding stop supported by both of said links' andtransversely bridging said throat.

7. A tool 'of the class described having swinging aws and anautomatically adjustable yielding stop transversely bridging the throatof said jaws and supported at opposite sides of said jaws.

8. In a tool of the class described the combination with swinging jaws9, of a stop having the portion 19 transversely disposed to the throatof saidjaws, and yielding mem bers at opposite sides of said jawssupporting said portion 19. M v

9. A'tool f the class described comprising, in combination, a cuttinglever, a pivoted operating lever, a connecting section pivotallyconnecting the levers, stop means for positioning said section againstmovement in one direction from one of said levers and projections on theopposed faces of said section and upon adjacent portions of said leverto limit movement in the other direction.

10. A tool as described in claim 9 wherein the connecting section isformed in two parts co-operating to support the stop means and betweenwhich two parts said stop means has screw adjustment.

11. A tool of the class described comprising, in combination, a cuttinglever, a pivoted operating lever, one of said levers hav ing an edgeflange, a connecting section pivotally connecting the levers andcomprising side portions embracing one of the levers,

stop means for positioning the section a g'ains'tmovernent in onedirection from said lever and projections on the inner face of said sideportions cooperating with said flange to limit movement in the otherdirection. v Y I i 12. A tool of the class described comprising, incombination, a cutting lever, a pivoted operating lever, one of saidlevers having an edge flange, a pair of links on op: posite sides ofsaidcutting lever and said operating lever pivo'tally connecting the same,stop. means at the hack of said links cooperatively supported therebyfor moving them in one direction from one ofsaidlevers and projectionson the inner faces of the linksadapted to cooperate with the inside ofthe flange to limit movement in the other direction.

l3. A tool of the class described comprising, in combination, a cuttinglever, a pivoted operatinglever, ane of said levers hav ing an edgeflange, a section pivotally connecting said levers, stop means forpositioning said section against movement in one direction from said onelever and an abutment on said section adapted to move 0V61';tl16 face ofsaid lever and to make contact with said flange to limit movement in theother direction.

form having side portions pivoted to said levers to. form linksconnecting the same, the bottom of said U presenting an abutment surfaceto one of said levers to limit movement of the section in one direction,the in nor face of a said side portion presentingan abutment and acooperating abutment on. a lever'to limit movement inthe otherdirection.

15.111 a'toolof the class described, pivotally united operatingelementseach havinga flanged-outer edge adj acent to thepivot for said elements,pivoted jaws, two-part connecting sections for connecting said aws withsaid operating elements, a lug upon at least one of the parts of saidtwo-part connecting sections to cooperate with the flange atv the edgeof its respective operating ele. ment in limiting the pivotal movementsof said connecting section in one direction with respect to itsoperating element, and a screwthreaded stop member carried jointly bythe two'parts of each ofsaid connecting sections to engage the flange ofthe operating element ad acent thereto and limit relative move.

ment of said connecting section opposite to V the aforesaid direction,at least one part of each ofsaid connecting sections having a transverseopening adjacent to the flange of its operating element. i

16. In a tool of the class described," pivotally united operatingelements each having flanged outer edges, pivoted jaws, two-partconnecting sections for connecting said jaws with the operatingelements, inwardly projecting lugs on said connecting sections to abutagainst said flanges and limit the outward swinging movements of saidconnectingsections relatively to said operating elements, enlargementsformed upon adjacent portions of said two-part connecting sections, anadjusting screw jointly carried by the enlargements of each of saidtwo-part connecting sections, said adjusting screws constituting'stopsforlimiting the inward swinging movement of said connecting sectionsrelatively to said flange, the parts of each or said two-part connectingsections having transverse openings adjacent to the inner ends of saidenlargements and the ad joining portions of said flange.

17. In a device of the class described, a pair of operating elements, apair of jaws, a twopart pivoting connecting section pivotallyconnectingeach of said jaws with one of said operating elements, each of saidconnecting sections being oi substantially U form having sides embracingits respective jaw and operating element, an adjusting screw carriedjointly by the backs of the parts of said connecting sections, at leastone of said sides of each of'said conecting sections having a transversechip opening adjacent to the inner end of its screw.

18. In a device of the class described a pair of elements, links onopposite sides of said elements pivotally connecting the two, said linkshaving opposed portions cooperatively forming; a not for an adjustingscrew for engaging on'eof said elements, at least one or the linkshaving a chip opening adjacent the inner end of the bore of the nutwhereby tappingo'i said nut may be effected after assembling.

19. In a tool of the class described, pivoted-handle levers, pivotedjaws, each of said jaws being connected to said handle levers by a pairof separate links, said links having edge portions abutting each other,said edge portions being provided with a screwthreaded opening, ascrew-threaded member 5 received in said opening to limit pivotedmovement between said link and its handle lever and a stop carried bysaid tool cooperating with the screw-threaded member.

20. In a toolof the class described, pivoted handle levers, pivotedjaws, each of said jaws being connected to said handle levers by a pairof separate links, said links having edge portions abutting each other,said edge portions being provided with a screw-threaded opening, ascrew-threaded member received in said opening to limit pivotal movementbetween said link and its handle lever, a stop carried by saidtoolcooperating with the screw-threaded member and an opening in theside of one of said links adjacent said stop. 1 p V 21. In a nipper orlike tool, relatively swinging jaws having transverse cutting edges anda freely arranged stop plate eX- tending transversely ofthe throat ofsaid swinging jaws and along opposite sides of said 'jaws to be engagedby'the end of the work and to limit the insertion of said work betweensaid jaws. i

22. In a nipper or like tool having swinging jaws provided withtransverse cutting edges, intermeshing teeth on said swinging jaws and afreely arranged stop plate extending transversely of the throat of saidjaws between said cutting edges and said teeth and along opposite sidesof said jaws to prevent the insertion of the work between said jaws intocontact with said teeth;

23. In a tool of the class described, pivoted handle levers, each havinga flanged portion adjacent the pivot thereof, pivoted jaws each beingconnected to one of said handle levers by a pair of links, at least oneoi said links having an inner projection to" cooperate with the flangeof its handle lever and to limit movement of said links in one directionrelatively to its handle lever and an adjustable stop carried by saidvlinks to limit the movement of said links'relatively to said handlelever'in an opposite direction.

24. In a tool of the class described, a pair of handle levers pivotallyconnectedto- 'gether, pivoted jaws, each of said jaws being connected toone of said handle levers by a pair of separated links having inwardlyprojecting lugs'to engage portions of their respective handle levers tolimit pivotal movements of'said links relatively to their vhandle leversin one direction and screwthreaded stop members carried jointly by therespective handle levers to limit pivotal movement of said linksrelatively'to their handle levers in opposite directions.

In testimony whereof, I have signed my name to this specification.

HENRY K. PORTER.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,476,640, grantedDecember 4, 1923, upon the application of Henry K. Porter, of Brookline,Massachusetts, for an improvement in Cutting Tools, an error appears inthe printed specification requiring correction as follows: Page 4, line106, claim 24, for the Words respective handle levers read links of eachpair adapted, and that the said Letters Patent should be read with thiscorrection'therein that the same may conform to the record of the casein the Patent Oflice.

Signed and sealed this 8th day of January, A. D., 1924.

[sEAL.] KARL FENNING,

' Acting Commissioner of Patents.

